<template>
<div>
  header {{num}}
</div>
</template>

<script>
export default {
  name: "Header",
  props: ['header'],
  data(){
    return {
      num: ''
    }
  },
  mounted() {
    this.$parent.runTime = new Date();
    console.log(this.$refs)  // {}
  }
}
</script>

<style scoped>

</style>